The Annapurna Circuit is a trek within the mountain ranges of central Nepal. The total length of the route varies between 160–230 km (100-145 mi), depending on where motor transportation is used and where the trek is ended. This trek crosses two different river valleys and encircles the Annapurna Massif. The path reaches its highest point at Thorung La pass (5416m/17769 ft), reaching the edge of the Tibetan plateau. Most trekkers hike the route anticlockwise, as this way the daily altitude gain is slower, and crossing the high Thorong La pass is easier and safer.